Human N-Acetylglucosamine-6-O-Sulfotransferase Involved in the Biosynthesis of 6-Sulfo Sialyl Lewis X: Molecular Cloning, Chromosomal Mapping, and Expression in Various Organs and Tumor Cells.

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  • Uchimura Kenji
    Departments of Biochemistry, Nagoya University School of Medicine
  • Muramatsu Hideki
    Departments of Biochemistry, Nagoya University School of Medicine
  • Kaname Tadashi
    Department of Developmental Genetics, Institute of Molecular Embryology and Genetics, Kumamoto University School of Medicine
  • Ogawa Haruko
    Surgery II, Nagoya University School of Medicine
  • Yamakawa Taishi
    Departments of Biochemistry, Nagoya University School of Medicine Internal Medicine III, Nagoya University School of Medicine
  • Fan Qi-Wen
    Departments of Biochemistry, Nagoya University School of Medicine
  • Mitsuoka Chikako
    Program of Experimental Pathology, Aichi Cancer Center, Research Institute
  • Kannagi Reiji
    Program of Experimental Pathology, Aichi Cancer Center, Research Institute
  • Habuchi Osami
    Department of Life Science, Aichi University of Education
  • Yokoyama Itsuo
    Surgery II, Nagoya University School of Medicine
  • Yamamura Ken-ichi
    Department of Developmental Genetics, Institute of Molecular Embryology and Genetics, Kumamoto University School of Medicine
  • Ozaki Toshinori
    Division of Biochemistry, Chiba Cancer Center Research Institute
  • Nakagawara Akira
    Division of Biochemistry, Chiba Cancer Center Research Institute
  • Kadomatsu Kenji
    Departments of Biochemistry, Nagoya University School of Medicine
  • Muramatsu Takashi
    Departments of Biochemistry, Nagoya University School of Medicine

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タイトル別名
  • Human N Acetylglucosamine 6 O Sulfotran

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抄録

N-Acetylglucosamine-6-O-sulfotransferase catalyzes the transfer of sulfate from 3'-phosphoadenosine 5'-phosphosulfate to position 6 of a non-reducing N-acetylglucosamine (GlcNAc) residue. We have cloned human GlcNAc-6-O-sulfotransferase cDNA, based on the sequence homology to cloned cDNA of mouse GlcNAc-6-O-sulfotransferase. The predicted protein sequence of the human enzyme was highly homologous to that of the mouse enzyme; in the 363 amino acid stretch of the catalytic region, the two proteins were nearly identical except for conservative changes in 3 amino acid residues. The expressed enzyme transferred sulfate to GlcNAcβ1-3Galβ1-4GlcNAcβ1-3Galβ1-4GlcNAc. Co-transfection of the enzyme cDNA and fucosyltransferase VII cDNA into COS-7 cells resulted in cell surface expression of 6-sulfo sialyl Lewis X. Fluorescence in situ hybridization analysis revealed that the GlcNAc-6-O-sulfotransferase gene is located on human chromosome 7q31. mRNA of the human enzyme was strongly expressed in the bone marrow, peripheral blood leukocytes, spleen, brain, spinal cord, ovary, and placenta, and moderate levels of expression were observed in many organs including lymph nodes and thymus. In situ hybridization with the mouse system showed that the transcript was localized in specific regions of the brain, i.e. pyramidal cells in the CA3 subregion of the hippocampus, cerebellar nucleus and Purkinje cells. Among human tumor cells, strong expression of the mRNA was found in MOLT-4 and Jarkat lymphoblastic leukemia cells, Raji lymphoma cells, K-562 chronic myelogeneous leukemia cells, U251 glioma cells, and G361 melanoma cells. Carbohydrate structures synthesized by the sulfotransferase may be involved in various aspects of the differentiation and behavior of blood cells, their progenitor cells, and neurons in the central nervous system.

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